Re: "Email is required" message while adding comment at blog module

Users who have signed in to your site will not need to enter an email, but it sounds like you do not want that. You can also use Facebook comments or Disqus or IntenseDebate, instead of the mojoPortal comments system. Each has its own pros and cons. IntenseDebate does not require users to enter anything other then a name, so might suit you. I've not tried Disqus.